Channel saturation and conductance quantization in single-atom gold constrictions
Channel saturation and conductance quantization in single-atom gold constrictions
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DOI：
10.1103/physrevb.82.195416
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发表时间：
2010-08
影响因子：
3.7
通讯作者：
J. Armstrong;R. Schaub;S. Hua;H. D. Chopra
中科院分区：
文献类型：
--
作者：
J. Armstrong;R. Schaub;S. Hua;H. D. Chopra
结果表明，原子大小的金收缩的有限弹性允许电导发生连续且可逆的变化。这是通过在金基底上稳定缩回/接近的金尖端上叠加原子级或亚原子级机械振荡来实现的。通过这些扰动研究，我们报告了稳定的单原子金收缩中通道饱和度和电导量子化的直接观察。此外，还解释了电导直方图中峰的起源，并且表明仅峰不足以评估原子构型的稳定性。
It is shown that the finite elasticity of atomic-sized gold constrictions allows for a continuous and reversible change in conductance. This is achieved by superposition of atomic-scale or subatomic-scale mechanical oscillations on a steadily retracting/approaching gold tip against a gold substrate. Through these perturbation studies, we report the direct observation of channel saturation and conductance quantization in stable, single-atom gold constrictions. In addition, the origin of peaks in conductance histograms is explained, and the peaks alone are shown to be insufficient in evaluating the stability of atomic configurations.